ppc direct linking

I am a publisher and I would like to know what are the best PPC program out there for me. There are so many PPC provider to choose from. But they some might not gonna give a good earning.

My CPA allows me to direct link to their landing page. So basically I "just" have to get a PPC campaign that gives me a good return on investment. Though I see many people here talking about the cpa companies spying your keywords. My question is how do I hide my converting keywords from my...